Abstract:
The present invention relates to a system for distributing electrical energy, comprising an electricity grid configured to supply electrical energy to end users, characterized in that the grid is operated on a direct voltage.
Abstract:
A bidirectional low voltage power supply (LVPS) for providing power to motor drive electronics. The bidirectional LVPS includes two simple, discrete converters. A first converter is used to provide power to an output and the second converter recycles power from the output to the power source. The first converter powers the drive electronics which drives the motor. During an operating process, the first converter shuts off and the second converter turns on to recycle power from the motor to the power source.
Abstract:
La présente invention concerne un circuit (9) d'absorption d'une ondulation de puissance destiné à être connecté en parallèle d'un équipement électrique alimenté par un circuit de correction du facteur de puissance (1), ledit circuit d'absorption (9) étant de type abaisseur de tension et comprenant : -un condensateur (19) monté en série avec une inductance (17) et au moins un interrupteur (15, 23), -un module de contrôle (25), -des moyens de mesure (27) d'un premier courant (I 3 ) destinés à alimenter ledit équipement électrique l'interrupteur (15, 23) étant piloté par le module de contrôle (25) pour faire varier la charge du condensateur en fonction de l'ondulation du premier courant (I3) afin d'atténuer l'ondulation de puissance, et ledit circuit comprenant en outre des moyens de mesure (28) de la tension (Vc) aux bornes du condensateur (19), et le module de contrôle (25) étant configuré pour asservir un second courant (I c ) traversant le condensateur (19) de manière à ce que la tension (Vc) aux bornes du condensateur (19) reste dans un intervalle prédéfini.
Abstract:
A method for transferring electric power from a primary side (5) to a secondary side (6) of a converter (11) and/or vice versa, in particular for the purpose of delivering electric power to a high power application such as to a driving motor of a railroad vehicle, wherein the converter (11) comprises at least one electric or electronic valve for repeatedly interrupting and closing an electric connection thereby operating the converter (11) wherein a detection signal is filtered by performing a filtering process (unit 50), wherein the filtered detection signal is used to control (units 4, 21) the operation of the converter (11) and wherein the filtering process is at least partly performed by a comb filter (in unit 50).
Abstract:
Apparatus for energizing a large scale medical imaging system, preferably in the form of a CT scanner, so that the scanner operates off an uninterruptable power supply (40) in the event that the external power (46) falls below sufficient power to operate the system so that system operation remains uninterruptable. The system is designed to operate off a broad range and types of external power supplies (46) including those providing DC, single or three phase AC power. The system therefore can operate from a common single phase AC outlet. In addition, power factor correction (80) is provided so that the system can correct for phase differences between the voltage and current at the input line (46) created by the input impedance of the system.
Abstract:
The present invention relates to a system for distributing electrical energy, comprising an electricity grid configured to supply electrical energy to end users, characterized in that the grid is operated on a direct voltage.
Abstract:
A power transmission network (10) comprises a plurality of converters (12a,12b,12c,12d). Each converter (12a,12b,12c,12d) includes first and second electrical terminals (16,18), each first electrical terminal (16) being connectable to an electrical network (28a,28b,28c,28d), each second electrical terminal (18) being operatively connected to at least one other second electrical terminal (18). At least one converter (12a,12b,12c,12d) is designated as a first converter, at least one converter (12a,12b,12c,12d) is designated as a second converter, at least one other converter (12a,12b,12c,12d) is designated as a third converter, the or each first converter includes a first controller, the or each first controller being configured to selectively operate the or the respective first converter to modulate a power flow at its first or second electrical terminal (16,18), and the or each second converter includes a second controller, the or each second controller being configured to selectively operate the or the respective second converter to modulate a power flow at its second electrical terminal (18) so as to generate a compensatory power to compensate for an imbalance in power within the power transmission network (10) caused by the modulation of power flow by the or each first converter and thereby inhibit the modulation of power flow by the or each first converter from modifying a power flow in the or each third converter.
Abstract:
A device (1) for connecting/disconnecting batteries for a DC bus (103) of an uninterruptible power supply or UPS (100), comprising at least one pair of identical batteries (4a, 4b) connected in series, so as to have a common node (F) at one of their poles, wherein the other pole of each one of the batteries (4a, 4b) is connected in series, or by means of a battery charger, to a respective connection/disconnection assembly (3a, 3b), each assembly comprising a pair of one-way switches (31a, 32a) which are mutually connected in parallel and so as to conduct current in mutually opposite directions.